Hippopotamus, meaning "river horse" in Ancient Greek, is a genus of artiodactyl mammals consisting of one extant species, Hippopotamus amphibius, the river hippopotamus (or simply the hippopotamus), and several extinct species from both recent and prehistoric times. It belongs to the family Hippopotamidae, which also includes the pygmy hippopotamus (Choeropsis liberiensis) and a number of extinct genera.
The word hippopotamus originates from Ancient Greek, meaning "river horse". The plural in English is 'hippopotamuses', although the Oxford Dictionary says that 'hippopotami' is also correct, but this is due to it wrongly assuming that it is a Latin word; going the Greek way would be 'hippopotamodes', but this isn't used in English.
Anatomy
Hippos have a barrel-shaped body, short legs, big mouths, short tails with hair at the tips, four-toed hooves with webbing, big canines used for defense, big upper lips with sparse whiskers, two little ears on top of their heads, their eyes, also on top of their heads, have horizontal oval-shaped pupils, and can range from brown to green, and two nostrils that can shut underwater.
†Hippopotamus minor, Cyprus dwarf hippopotamus (late Middle Pleistocene-Late Pleistocene, synonym Phanourios minor one of the smallest known hippopotamuses)[3]
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